Premium Quality – Franklin Armory BFSIII M4 Binary Trigger Lower Receiver 5.56 NATO Black Hardcoat Anodize AR-15 / M4 Lower Receiver
Original price was: $343.99.$144.48Current price is: $144.48.
Specifications
Action—-Double Action
Finish—-Black Hardcoat Anodize
Capacity—-30
Caliber / Gauge—-5.56 NATO
Manual Safety—-Yes
Trigger Safety—-No
WARNING: This product can expose you to chemicals including arsenic, which is known to the State ofCalifornia to cause cancer. For more information, go toWWW.P65WARNINGS.CA.GOV
Product Overview
Franklin Armory BFSIII M4 Binary Trigger lower receiver is built from forged 7075-T6 aluminum and finished in Type III hardcoat anodized black for durability. Designed for M4 / AR-15 pattern setups, it integrates the Franklin Armory Binary Firing System III for rapid follow-up shots and improved control with standard AR-style controls.
Key Features
- Forged 7075-T6 aluminum receiver with Type III hardcoat anodized black finish
- Built-in Franklin Armory Binary Firing System III (BFSIII) for binary trigger operation
- M4 / AR-15 pattern compatible for use with a 5.56 NATO upper
- Specialized tension screw helps eliminate upper/lower play
- M4-style carbine receiver extension compatible with a reinforced 6-position collapsible stock setup
- Supports standard AR magazines with a 30-round configuration and restricted-state options (10/20 or 10/30)
Upgrade your M4 / AR-15 pattern build with a BFSIII binary-trigger lower receiver engineered for fit, function, and hard-use durability.





